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    <title>数学公式</title>
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    <p>$$\int_{-\infty}^{\infty}e^{-x^2}dx=\sqrt{\pi}$$</p>
    <div>$$\int_{-\infty}^{\infty}e^{-x^2}dx=\sqrt{\pi}$$</div>
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            $$\alpha$$
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